Actually I calculate OLY's hold at 170% which is similar to most (perhaps a bit lower). They are a bit on the high side this week - usually the hold lands between 165 and 168. I guess all the back up cars and confusion have convinced them to raise the bar a bit for this week. When everyone used to use Roxy's line he had the hold consistently at 173%. So it has come down a bit.
In comparison, Carib's hold is about 185%, WSEX is about 171%, Intertops is about 170% and the Starnet books use about 195%. I guess the slight difference is that Bet365 and Starnet list everybody where as the others have a 13 car field or so. But the bottom line is that Bet365's lines suck, not to mention the maximum bet is something like $50.