In reply to Blue Straggler: it IS possible to stay cheaper, but it all depends how you do it. Crucially, if you want to stay in the most popular climbing guesthouses or at least nearby (which, for me, makes for an infinitely better experience), then the average costs are as follows, NB this time of year are peak prices, but I don't it goes down much, if at all, until end of Feb, which is also when it gets really hot:
Cheapest accom = 100 rupees a night (a mattress and mosquito net on the roof of Goan Corner guesthouse), basic hut 300 per night
x 30 = 3000 to 9000 pcm = 35 to 102 pounds a month
3 x meals a day at 300 rupees a day = 100 pounds a month
So maybe I did overestimate things a little, but it's not uncommon to treat yourself to the odd coke, wi-fi sesh or whatever, so giving yourself (quite a generous) extra 100 rupees a day that's an extra 35 pounds a month, grand total around 237 pounds a month. If you're doing 300 quid a month then you're treating yourself quite alot. Most climbers are pretty frugal so, like me, you can probably expect to spend around 200 quid a month here. Very cheap! Hope that was useful for people (and it's helped me to clarify things because it's the first time I've properly worked it out!).