That's £100 per hour which is much better than most jobs. That's most likely a statistical aberration, but if you assume the people they go back are also the people that won in the first place it probably seems to be a winning strategy.
That's assuming people that go long streaks without winning then stop.
I suspect she's mistaken about how many hours she puts into it.
Maybe not. Maybe she just worked hard perfecting her skills and can make 100 pounds / hour, but is picking the most profitable opportunities. Some side gigs are like that - you can make a huge hourly wage on something but only for a few paid hours a month.
> The operator of a popular sweepstakes blog, she has made the hobby into a full-time job.
So far in 2019, she's won prizes equivalent to £5,389, or about the same as working 110 hours/month at minimum wage[1]. Given that £2,000 worth (Majorca trip) is tagged as "Group win", and most of it appears to be stuff you couldn't sell at retail price, or just couldn't sell, I find it difficult to call that a full-time job.
[1] (£5,389/6 months)/£8.21 an hour = 109 hours
Contest winnings are income, and therefore subject to income taxes. Contest winnings above a certain amount are subject to withholding, but the winner may need to provide the cash for withholding if the prize is non-monetary and the prize doesn't include an adjustment for taxes.