R.P. Cheltenham Tipping Contest - stingy prize money ??

They're putting up £20k in total prize money for their comp. I would guess that at £5 per entry and several entrants (like me) paying £20 in their 5-for-4 offer, their total take from this could be in excess of 100k, given it looks quite attractive to both serious and fun punters. Good competition, and of course they need to make something to cover admin and profit, but imo prize money could be more generous ....