The following is my opinion, and NOT a personal attack. It applies to everyone who has though about/done this in the past, and is NOT meant as a personal attack against an individual.
It was an extremely noble thing to do... however I agree that you are not supporting the overall species. I am sure that these 18 will do fine now that they are in your care, but what about the 40 that they order to replace them? You claim you're short on cash but can afford buying all of them, every time they come in. You're simply not going to be able to buy EVERY leopard gecko that the store sells from not until it closes. Perhaps enough calls to the police for animal cruelty would do the trick.... never happen... but nice in theory.
It seems the way to get better care for the leos they carry, would be to offer free training to the employees, educate the staff, and work your way up the chain of command. Give them a stack of care sheets on the animals to be handed out with each sale. This way, ALL animals they get/sell can recieve proper care.
By purchasing these animals you ARE helping their bottom line. They want people to buy animals. Not to enjoy them for the incredible species that they are, but for money. Some stores and/or people at the stores may care, but many do not. You are telling them that this poor treatment is OK, and that they don't have to spend extra money caring for animals to sell their stock. Why would they spend the extra money when you've proven that people buy them anyway?
It's like going to a horrible breeder, seeing that they are bad, and buying them all. They are NOT going to improve things this way. The breeder will see that they can sell all of their animals exactly the way that they are, and produce more to make more money.
You did not do a favor to the overall species by supporting the 18 that you saved. You helped continue the cycle that supports poor care for animals as long as it supports the bottom line. Thousands more are being bought across the country that will NEVER recieve the care they need. It's much easier to educate the majority of people than it is to personally take on the responsibility of caring for EVERY leopard gecko sold.
I don't really want to start a huge war over this, this is just my opinion.
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Brian Skibinski
Milwaukee Reptiles
Brian@MilwaukeeReptiles.com