I was in the 'luxury retail' sector for many years. Escorting is exactly the same. We offer a 'service': Making our clients happy - by providing a 'product': Sex.
The better we are at providing our product to clients through a great service, the easier it is to gauge our rates. Too expensive and you could price yourself out of the majority market, too cheap and you're perceived as desperate for sales or offering an inferior product (which is not necessarily the case). It's a fine line setting a rate that will give you a good turnover without having to over extend yourself. It also depends very much on yourself: Your overheads, availability etc, the 'tenner a go' lady could well just prefer to be super busy for x amount of time a day and just does it for pocket money cos she likes sex. While others will charge 500 an hour and see one a week... *insert infinite amount of variables here*
Every snowflake is unique...
If you feel you want to drop your price, then do it by a small margin for a limited time as an offer as suggested. See how it goes. Does your turnover increase? What about quality of client? Then do the same exercise with a small increase in price. It's like navigating on a VOR, you find a rough corridor where you want to be and then through trial and error you make adjustments till you're heading where you want to go or need to be.
I personally have low overheads, so 70 and 130 suit my needs and lifestyle perfectly. I'm ticking over really nicely with a good mix of half hour and hour clients.
As an aside re 'agencies': Try it and see if it works for you. I did and personally working as an independent is infinitely better, for me. I can vet my own clients, so feel safer, can turn down bookings if I don't want to see a certain person, so feel better for not having done the booking, I work when the hours I want to, and best of all, I don't have to give away a huge percentage of the fee. I've also noticed a dramatic increase in the quality of clients I get now as opposed to through the agency, but again, that's just my personal preferences at play.