What is stopping someone that wants boosting to just purchase from an actual boosting website designed for Overwatch boosting? I have a friend that works for an OW boosting site and the prices if I am not mistaken are either cheaper or exactly the same as yours.
The only thing I can think to reply to this question (from a customer perspective) is that it seems OP is offering Coaching services as well, which seems to be rather unique; many power-leveling or boosting services don't offer coaching, and normally they are unable to provide coaching because they regularly are cheaters, not professionals. I've noticed that your prices are rather similar to "official" Overwatch boosting services and so beyond the coaching feature I am wondering the same thing about your prices.
Would you be willing to offer Coaching services for a few hours for free in order for me to write up a review about what is being offered in that area? Boosting is rather straight forward, either you produce the results you've claimed you would or not, and whether or not the account gets banned. Coaching seems to be somewhat a different beast, because it would be a much more arbitrary or opinionated exercise.
This requires the ability to connect with those you are coaching, and are there any sort of results guaranteed, expected or even hoped for? I am wondering what the goals of each coaching session would be, I am terrible at Overwatch and would like to be a more feasibly skilled player when I queue up with my buddies. Would you allow some coaching as a vouch, this way I can talk about everything I've learned, how attentive, responsive, etc. you are. This is just a thought, because I wouldn't be paying for coaching without knowing what I am getting, or at least reviews from others.
99% WR? Even pros dont even get that.
If you'd like to give a battletag of one of your team members that people can verify (Get someone else to verify through messages) that you are in top 500, that would be good. I'm not even sure whether people have hit the 200 game eligibility check.
It's possible that they're lying, obviously, or it's also possible that they are using their win-rate in Bronze, or their win-rate while using this service or their win-rate on a particular alternate account; it's entirely believable that he's using a win-rate based on a more "well"-defined window than we'd all assume. That being said, everyone would feel better if you'd explain what you mean by this percentage and if you would provide proof of your rank, skill and the other integrity checks Decoded has mentioned.