Don't forget that initial issue of a class 1 medical is likely to have a bunch of additional stuff not required for class 2, ie proper eye tests including glaucoma tests, hearing tests and ECG. Some DAME's can do some of these in-house while others send you to specialists (eg path lab for ECG, hearing test centre for hearing, etc). This adds a whole bunch of additional costs to that of the DAME. A lot of these are triggered by threshold ages, but class 1 puts you on a new merry go round of additional tests.