I can't say why they loose but in my experience they do there are only two kinds of stakeing that i would recomend to anybody level stakes and percentage of bank.

Percentage of bank is the best if you want your bank to grow.
Some people say that the retirement stakeing plan is the best stakeing plan around because it uses your average price winners to determin your stake.
The truth is if you want a large bank you have to save it or risk a small bank to create a large bank...the question remains what size bank do you need to have to make a decent return each week.
How does $500 sound tax free...you would still need to work but an extra $500 dollars to play with would be nice.
Lets look at it like this if you could get 10% t.o.p you would need to turn over $5000 a week to get $500 now if you have 10 bets a week that means your are betting $500 a selection now if we are betting to a percentage of bank say 2% you would need a bank of $25000 to start a lot of people say you need 4 times your estimate to be safe thats $100.000 but with $25000 you can make $500 a week and with i higher t.o.p you can make even more.