Well guess what, fcuking software's working now.
So here we are...
First chart looks at risk of bankrupcy for 5 point pyramid plan (starting bank 100). After each loss, stake increases by 5 points, after each win reduces by an amount equivalent to 5 x (decimal odds of the winner minus 1), to a minumum of 5. Maximum number of bets 250. Expectancy is simply the chance of a win as estimated by the bookie's odds, or 1 over the decimal odds, so the higher your expectancy the lower the odds. Betting edge is your edge over the bookie. Less than 1 means effectively you have no edge and cannot possibly profit long term whatever you do.
Second chart compares 5 point pyramid staking, 5 point Martingale and 5 point level staking, again starting bank 100, maximum bets 250, for bookie's expectancy of 0.5, i.e. odds of 2 (evens)
I think you'll agree, Pyramid, like Martingale is a complete waste of time and effort getting you nowhere fast.