In an ideal world probably MorphOS would be free of charge and the users would willingly give a fair share of their resources to the developers. But that's probaby just dreams...
The current price of MorphOS is what it is. You can recalculate the ammount to equilvalents of pizza, beer, the cinema or what you give to charity or #?, but eventually it just is what it is.. The team set an ammount, take it or leave it.

Of course this is a free world (well, parts at least) you can raise your voice and suggest other sales methods or prices - but there is no obligation to follow these suggestions. And indeed for some 79 € is rather peanuts, for others this is quite an ammount, but the MorphOS team just cannot cater all cases, hence a price that is probably okay for most ppl in the countries MorphOS has most of its fans (Europe and US).

The offer is as it - take it or leave it. Maybe some suggesting or complaing, but - gosh, please - no mimimi!