dead heat rules

i'm sure this has been covered many times on here before but whats with the new rules on BF dead heats', it used to be half your stake . tonight i had a £5 win on extra noble @ 2.5 a clear winner would have produced a profit of £ 7.50. Normally you would get paid half stake in my case £2.50 @ 2.5 giving a profit of £3.75, instead i got a return of £1.10 !!!! less than 30% of the  old payout, im assuming that the layer also gets a bum deal and betfair keep the other 70% to themselves..... is this right ??????