Well, apparently the OP has lost interest in this discussion...
If he were still here, I would suggest that he simply give this company an opportunity to give him the full pitch - then evaluate it on its merits, and evaluate the company itself on its actual track record.
That means get very specific: What precisely do they propose to do for your band? In particular, what, if anything can they do for you that you cannot do for yourselves? What do they require in return, and on what specific terms?
Invite them to provide you with some case studies. Ask to speak with a few of their current & former clients - then follow up.
There are a lot of companies out there in the performing arts industry with a business model based on picking the low-hanging fruit of young, naive, inexperienced artists who need a lot of help making connections and making a name for themselves. The services they provide, while legitimate & legal, are largely things that any business-savvy artist or artist management company would already know how to do - and would already be doing them. Then, of course, there are the pure scam artists who don't provide anything of value, and simply try to rip you off.
If I were the OP, I would have at least listened to their full pitch, before reaching any conclusions.