I spend £5 a month.
I remember once spending £1 on a private gallery which made me abort a punt that would have cost me £100 and two hours travelling time, best £1 I ever spent.
This has also saved me numerous trips to see the WGs, having seen their PG.
I know some members don't subscribe to PG Gallery, let alone become a member there.
Most genuine PGs usually charge 50p or £1 for 24hrs viewing, so make it worthwhile checking them out,
if planning to see them.
(Yes, I know the scammers usually charge similar fee as well, but this is off-topic).