I get the idea that its annoying to bust a lot of materia but the bigger picture is unless its the .0 patch you have 6-8 months to get materia for the next set. If you run your daily expert or you do hunt trains you will overflow so much materia that you wont need any more. If you run low, just overmeld a single 10 on each item the extra 2/3 9s are not gonna be a deal breaker in 99% of situations or do you use 5 different jobs to raid and all need 5/5 melds in full crafted.

6.0 + 6.1 is same crafted gear and so will be 2 and 3 etc. you also likely use some tome or raid gear which cant be over melded, so this is really only a problem for players who play a lot of jobs or want to day 1 savage on the first patch cycle with new materia.

This also works for crafting and gathering btw, do your weekly custom deliveries and stack up the materia once you bought all the items you wanted.

Once the upgrade items for 590 Tome gears are added to Hunt points, players will swamp out materia on the market because its by product of Hunt trains and this will effect the prices all the way up to 5.5. Hunt Trains are the easiest way of continues upgrading for tome gear after all.