Likely implemented to dissuade PG scammers regularly changing location to ensnare unaware punters.
There is also a charge of £4.99 to change to back to your home location
When you change location you change 4 things....
Area...eg Wales
County...eg Carmarthenshire
Town...eg Carmarthen
Postcode...
You have to change and get right every one of those before hitting pay because if you get the area or postcode wrong they charge you a second time to change it, so potentially it could cost you much more than £4.99, you cannot pay for this service out of your PG sales or credits, you have to pay with a debit or credit card.
They as stated charge for Available today but they also charge to show as local escort, and to be featured as escort of the day on the front page, the featured facility is via an auction of sorts, there are a limited amount of places each day and they can sell out well in advance, I believe they become available 4 weeks before the feature day and the fewer spaces left and the closer to the date it gets the higher the price, I've seen it over £50.
There are dozens of ways in which they make money out of escort profiles but it is what it is.
The thing I find frustrating is like Strawberry said, they add vat onto PG sales so you guys pay more than we charge, we don't see that money they keep that slice, then if we want to cash in credits they take a further 30% off us so they are getting paid twice for the same thing.