Okay since people don't realize the potential problem with something like this and no one wants to explain it clearly:

The issue is NOT the fact that you can buy more retainers. The issues is what these retainers may be able to do. If they can go on Ventures, then it's 100% P2W no matter how miniscule the advantage is and only benefits RMT. Unless there's a limit on how many retainers you can buy, you can drop $100 and have all 100 retainers go out on ventures and farm stacks of mats for you. It would actually just be SE providing the bots at that point. Though from what it seems like, it takes these tokens to go on ventures which means that it wouldn't matter how many retainers you bought because they all have to go on ventures using the same token pool. However, this problem could appear again if SE starting selling Tokens in the cash shop.

The second issue is more of a gray area. Can these retainers sell to the MB? The MB largely limited by the inventory space of the retainer. If you can buy more retainers that can sell to the MB, that is an advantage. As a business owner IRL myself, I can tell you that is 100% an advantage and would be P2W. If you can only sell 50 items, but the next guy can sell 100 items then the next guy is going to end up making more money than you.

If the added retainers were JUST mules, then it would not be a problem. Yet, we have no idea what they are so SOME concern is valid.