We increased our reserve to 35BTC.
It's obviously a great thing that you managed to expand your reserve, but in reality, it doesn't hold much value since people can't verify if this is true unless they actually send in 35 BTC, but that won't happen. Are you okay with signing a message from an address, or addresses containing these coins in private to a trusted forum member? It will help you gain some credibility, because at this point there isn't anything that gives people a piece of mind when making use of your service.
And what guarantees can I get? How can I be sure that I will be returned to the bitcoins?
As what has richardsNY, it will bring you credibility in the business specially that you are new into the tumbling services. I can't remember but there was one mixing services that went to this route and nothing has happened. In fact, a lot of members started to used to used their services as a result. The business you are in are very tough, although bitmixer.io has gone a lot has been popping up including you. So don't get us wrong here, we are trying to help you establish yourself in the forum.
Thank you very much for your help and advice, we will think over all this. The fact is that now there are a lot of customers, and there is no need to risk the whole reserve.
But as soon as our reserve significantly increases, we will have to do about what you say, so that the bitcoins do not stand idle and we could attract new customers.