I paid something like $60 for KVS tool to help with a booking this year - it was a big help, but going forward I'd be just as likely to pay someone else to deal with it.

Honestly I'd be more likely to go with a person charging $50 than a higher rate, but I would also completely understand when the price goes up...

But I would warn you that Gleff is high on my list due to me knowing of his service via his blog posts and (regular) valuable content found there, so keep that in mind when you do start to raise your rates.