they are max stats for their req, which makes them perfect in a technical way. spears are then used in sc occasionally to boost the damage output with autohits. this is not really a big impact but it is about getting things done absolutely fast so it's a bit like tickling the last bit of HP when tuning a car - and just like there there is money for those things.
the shields are much rather just a collectors thing and there are some that want a set of all skins - and the woven is rarer to drop in those stats.
I think this covers the most relevant points.
edit: ah well - and on the other side they aren't too coomon to drop in max for q0 and you need to know where to look for them.