Since we can attune them, levels for sets don’t matter as much. Merits are easy enough to come by, plus you can trade attuned enhancements now.
Hang on let me see if I understand this correctly. Let's say I have managed through some sheer luck to get a full set of recipes for an MM pet damage set but the recipes are level 15. Since these are low level recipes their ingredients are also cheaper than their 47 level counterparts. So I then make this pet damage set and then attune it. So are you saying I can use this completed pet damage set to level 50 because it levels with my level and I would have only spent the amount I need for low level ingredients. Is this correct ?