we have 14 acres, 3 dry lot pens with each pen having shelter along with automatic waterers. My question is, we were possibly looking at boarding 2-3 other horses and have never done so. Cons to this? And rate wise, what would be fair if we were to offer hay, pasture price then pen price wise? I know other horse people can be straight psycho....so still leery about it. Just something we are possibly considering. 

Personally I would run, run away really fast from this idea.  For one like you said, lots of crazies out there.  Besides that you would lose all privacy on your own place.  People in and out whenever, couldn't run to the barn in your Pj's if in a hurry among other things.  Hard to get rid of them if they don't pay, opening up yourselves to frivolous lawsuits. I just wouldn't!

PM Cowgirlup012002, she has a set up pretty much like this I think for her boarders. Or maybe she will see this and have a few answer's for you. 

Pro- it pays for my horses vet bills, entries, feed, truck, trailer and farrier. I make a little money on top of it. But I have 25-30 boarding horses and 3-4 training horses.

Cons- it is exhausting, you have no privacy, it is a head ache if you dont have good boarders. I have been doing it for 7yrs now. It took me 3-4 years to make sure I pick good customers, I bite drama in the butt and will kick someone out over it. You need to make sure you have multiple good vets that will help you if something happens. I can call mine and get anyting I need asap. Have a good feed program is key as well. I personally want all on my program, bc it is a pain when you have 10 different feeds to feed and if owner forgets to bring some then horse is out. Make sure you really figure out how much it cost you per day in feed and hay. I own a feed store so I always have access to my feed and hay. We also bale our own hay. I normally dont put more then 2 horses in the same pasture, and I pair them with who works best. I normally never mix mares and geldings either. 

We have 8- 1 ac pastures with run in sheds on each one horse each run. 6 -2ac pastures 2 horses each one, 1-3ac with 2 horses, and a 15 ac with 4 horses. 4 large stalls with runs

I charge between $350-$375 full care for pasture and $450 in my stalls with runs.

I have a great nutrion consultant on hand that helps with our program, a couple great vets, dentist and awesome farrier. 

If I move off this place I will never do it to the extent that I do now. I rather go back to riding more outside horses if I have to, to cover my bills and stuff.

I was a boarder for about 10 years total during college and sometime after college until we bought land. I have been told by multiple land lords that I am 1 in a million because I did a lot of work around the place.

During college my horse got about 15 acers of pature and run in shelters. They provided hay during winter and had an indoor arena. I had to provide grain. They fed twice a day and I paid $200 bucks a month. 

My last boarding situation was even better! I was there for 7 years. My horse was provide a small pature with run in shed. They provided hay and I had to provide the grain. They had an outdoor arena that I could ride in year round. I only paid 100/month. Sometimes they didn't have me pay at all because I did so much around their barn. I cleaned stalls once a day and fed mornings. They became my family and now that I am gone I will house sit for them and bring my horses when I do. During the 7 years there were other boarders maybe 3 but they never lasted 6 months because they didn't hold up their end of the bargen. (It was pretty much you need to come and take care of your horse)

I know there are crazies out there but sometimes you find the good ones who treat your place like you do. Now that I have land I am going to have 1-2 boarders out here to fund my barrel racing.

Write up a good contract and communicaiton is key, be transparent. If you don't like somthing, say something. Good luck!