Why so few payouts and they don't add up to 50? Are there a lot of entrants that have a minimum amount to send set so their balance is accumulating?
Yes, there are lot of rewards under threshold (many people set treshold to even 10-50 btc), so this is normal. Also few people have bigger reward than is currently in the wallet - don't forget that reward is counting directly when block is found, but it takes many hours until bitcoins arrived. So this is natural behaviour. Don't be affraid, everything works perfectly.
