Regarding the negative (historical) trust, unfortunately for us, there is no formal way on bitcointalk to open a dispute or request re-evaluation. One person who have rated us negatively passed away (RIP) and the rest are either inactive or do not reply. So, looks like we will have to keep moving with it and just keep up with hard and decent work.
And regarding small races - yes, the prize pool is small atm, but we will change it soon, and for those who want easy (although smallish) win now - welcome. But be sure we will make our $500+ Races regular.
The same applies to sportsbet.io account, despite the fact that past is past and that company has enormously changed, they still carry Zepher's negative trust. Btw what you luck is more trust on your profile that's oriented on your gambling products, just see trust profile of other casino representatives here and you'll understand what I mean. Those negative trusts doesn't play too much role right now because as you see, some of them are turned into neutral and this messages users that past is past and this company has changed too. Just keep up doing the work and do your best to gain higher positions and be great in your niche. Trust will come automatically and people will ignore old ones, I think they ignore them too and that's a reason why this casino is more alive than others.