There's absolutely no harm in a little negotiation, if done right.
I'm not advocating haggling on arrival (as, even if successful, you'll compromise the punt), but when enquiring in the first place saying something like, 'I'm a little strapped for cash at the moment, but would love to see you. Any chance of paying £x for y time?'
Prossies will often fuck you for less.
Some can even find the above direct approach rude.
For 1st appt. with a WG who has been recommended, I have been known to ask what their rate would be
for a 2 hr appt (never for 1hr). The sharp ones click pretty quickly and I have paid as low as £150 for 2 hrs.
For 2nd visits and more, I was told by a fellow punter to mention that you are currently short of funds and
hope to see the relevant WG when you've saved up enough. It's amazing how special offers text messages
and emails start coming through thereafter.