If you know you can deal with the day to day stuff for 3 and you can rest easy with the regime go for it. I have 3, 2 in full work and a mini who is there to make me smile every day. I'm planning a 4th but need a good healthy budget and a bit more time to do them justice. Life is too short, no horse is ever standing in a field wishing they had more work, if you can give the care and keep them healthy and reasonably fit they'll be better off than many horses out there. Enjoy and don't forget to share lots of photos.