I wouldn't let them go for free. I will be selling mine for about £15-£20 each, to cover the cost of food and care etc. That price will go up if i vaccinate before letting them go to prob about £50 (got to enquire about that). I wont be making any profit on that i dont think. Does that seem fair?

But if your going to continue to rescue these cats then its you that will be paying for everyhting...so a little charge is acceptable.