Just want to say that you may hardly have $500ish offers, maybe just a range of $350-400max because 1. There are too many smurfs of the most notable skins and there aren't any popular character sets (ex: Ren x Haru is rare, Kim without Edward is insufficient etc) in your acc - 2. Android accs are low in demand and there are also too many underpriced Android in general. It's not about your acc, just how low the standards are for Android. And in private groups, the prices would even go lower (ex $30 for Futaba)
You can try waiting for crossdevice feature to have actual fair offers for what is in your account.