I agree with others that $495 sounds steep for now. Here are a few ideas I tried that you might want to consider first:
I met with a professional book consultant to glance over my query letter and strategize with me - $60, well worth it. I asked a professor at my alma mater to share my letter with her editing and publishing class (slightly older students than my target audience) and she created an extra credit assignment - well worth it, again. I also cajoled former colleagues in my field to be on my "review team" and asked them to provide their feedback on the first chapter - I treated to lunch sometimes and listened intently. I owe them all much more than lunch.
I also realize that because my husband is a technical writer I have in-house proofreading and editing - for free. Nothing's really free, of course, but my point is that I truly did not have extra money so I found other, creative ways to get professional assistance at low- or no-cost during my query and proposal stage. I hope these ideas help you think of other ways to get the review assistance you need without spending so much money.
I'm from Milwaukee, where frugality is a badge of honor.