That could be a good deal depending on the amount of hours she provides
How?
If you go with WGs that are priced at £150 an hour and give a relatively decent service that's 10WGs.
If you go buy parlour/brothel chicks at £100 an hour that's 15WGs. At £60 for 30mins that is 25WGs. At £40 for 15mins that is 36WGs with some change left over.
The latter breakdown works out better in most situations as you get a variety of experiences for the money spent with different WGs than having one WG that will give the same service and most likely get complacent, especially if the person most likely has some form EAS. £1500 for one chick for a "month" could only work for a time poor, cash loaded guy that only wants to fuck one chick and have her at his "call", not sure how many of those guys are around

. Those type of guys that do exist though, most likely have more money than sense as they could go through agencies and still work out a better deal, if they just researched than paying a chick that studies law which is an extremely demanding subject... for what most likely would be a couple of vanilla meets a month and fake GFE conversations which could work out to less than 10 hours "work" on her part

. It's smart on her part for trying but I do not pity the fool who buys what she is "offering".