Only one VERY IMPORTANT thing: you have to declare the applied fees.
It's not important how much your pool is performing good, if you guarantee good payouts people will continue mining even @ 5% fees, but you have to tell us how much we're paying for the service.
I haven't decided on the final model/numbers and want to see how it's working and what my server cost will be when accommodating bigger overall hashrate and much more users than my closed beta with only 20 users, so for now please just judge based on after-fee profits/stats if it's worth mining here or not.
Currently the fee is progressive as I described earlier (and I want to test if this is a feasible model in a higher scale than in my closed beta), so the fee goes down if the results are worse than average, even down to 1%. What I can tell you is that for example today's fee is lower than you mentioned. It's not like I cut 50%. If I were able to deliver this profitability with sky-high-fee it would mean that other pool admins are either cheating or are straight incompetent, because they deliver lower profits claiming 1-3% fees.
I might post more details about the progressive fee system once I test it/tweak it/decide on its parameters, but I don't want to commit to final numbers just yet. Please give me some time to test this system, see how it's working and how big servers will I need for this - and for now please decide based on post-fee profitability.
That's fine for now, i'll judge your pool only by profits made, but your reasonment here have a great bias: the variable here is the fees income, not the server cost. If your pools perform better than expected you could set LOWER fees, while in "bad days" you could need HIGHER fees to mantain the servers.
If you otherwise decided to set variable fees in the way you said for marketing reason it's more understandable. But, either ways, i think you should asap declare how much the fees actually are. No way to test if you're saying the truth since we don't know what coin we're mining so we can't do a accurate estimate of the expected profit (just some guesses based on net difficulty), but knowing how much fees you're paying make the user much more confortable.
PS: me too think that multipool owners are at most cheaters or incompetent. Never find a decent multipool till now (i.e. better than mining doge or whatever on a single pool with ~1%fees, switching coin every 1/2days), i really hope that yours is different