You're right. We don't know for certain. But I'm still going to go out on a limb here and say they will be pretty marginal materia at best. Most of use have hundreds of thousands of guild marks. SE knows this.
Special 1.xx exclusive materia would be something awesome to show off, especially if its useful :)
I wonder if the guildmarks will all be considered one pool for purchasing purposes or if they will only allow you to buy, for example, harvester materia with guildmarks obtained from the harvesting classes.
I want to get shards, crystals and clusters with them now that fine sand is a PITA to make.
lol yay a use! For fun I added how many I have up:
1,091,094
I wonder how much the stuff costs, any way I can probably buy a few <,<;;
Indeed, what a massive load of bollocks. They have no imagination whatsoever. So bascialy was a complete waste of time getting those guild marks for the first year of playing. They couldnt think of anither way to use them. Yep just take the easy mode and give us shards. thanks /facepalm