Andy, the only 'good reason' for having posted 341 reviews on such a site, is if they pay you £100 per entry.
I didn't get £100 per review but over the years I got an iPod Shuffle, a £50 Amazon voucher, and iWoot voucher (can't remember how much that one was for), two photos of my choice turned into oil paintings by an artist called Garth Bayley, a t-shirt, a couple of mugs, a frisbee, a memory stick, a shopping bag and bag of Haribos and a cuddly toy. I also got quite a few invites to parties and other exciting events, unfortunately as they were all held in London, and on one occasion in Pembrokeshire, I never got to go to any of them
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n.b. I've just had a look at Garth Bayley's websites and some of his paintings are priced at £800+ so maybe one day in years to come my two bespoke paintings might be worth a bob or two and I might just end up getting that £100 per review D).