I guess it depends on how far in advance you book Jon. My Rhodes-Symi tickets are for two weeks time and they were at 10% discount but the return trip two weeks later came up as 50% off. Actually, it gave the option of choosing between 10% or 50%
Normally I wouldn't dream of booking so far in advance but hey, six Mythos is not to be sniffed at!
Well, you could.....
Pleased to hear you saved enough for my one Mythos though.