Normally I ignore the competition. I mean that I usually care less at what they do and do my own thing. I react to the market more than what an individual is doing. I would imagine that I miss some opportunities to mess with them by ignoring them. Recently I cut back my presence in the glyph market. Posting fewer times and not crafting as often. That threshold that I used to have lower than everyone else has been pulled up. So my market is very cutthroat at the moment and I am adjusting to let everyone else fight each other.
I decided this is a nice time to take a look at who they are. I put together a spread sheet and logged various details. What class of glyphs, min and max buyouts, durations, post counts. I ended up with over 50 names of posters. Some only had a few up so I didn't record much more than the posting name and what looked like min buyouts.
I found 7 major player that covered all glyphs with a single character. I found one player that used 3 atls and was able to connect them to each other. I also use 3 alts and I believe it would be very easy for my competition to connect them to me. Of those 8 other players, 3 of them post their entire inventory for 48 hours. 2 of them post 2 at a time for 48 hours. 3.07g was the highest threshold of them. Looks like 2 do not have a threshold. Only 2 of them had a high fallback (60g ish) and the others had fallbacks of 7-14g.
Of the remaining names on the list I found 7 people posting glyphs under 1g, 11 people posting some 1-2g. Most people posted with 48 hour auctions. I saw about 5 listings where the glyphs were in a stack.
I also saw a few people with a small representation that I know also work the market. I expected to find them as one of the major players but they had a small representation on the AH. Many things could cause this so I will not rule them out. They could be more selective with the glyphs they are posting in this market now or even giving it a chance to reset.
So I will say this market feels more cut throat than before. This last week I only crafted twice and posted less than half of what I normally do and had 740g a day in average sales over the last 6 days. That is way down from the 3-5k a day I was pulling a month ago. But I'll hang back collecting my small sales and be ready to dive in whenever the market resets.