G'day Shoota and yes, well up until I had problems after surgery, I was a regular kayak diver down south in Victoria, have not dived or kayaked for almost 9 months now. Not as regular as myself (I don't think), Top Gun (Maverick (on VYAK)) chasses scallops every now and then and Matt also dives, chassing Crays, + one other who does not frequent any forums, and they would be the only others down this way I really know.
Almost all my dives were solo, mostly reef drift or scallop drift dives. As I mostly drift dive with the kayak in tow, it is not really suited to multiple divers trying to buddy (well that's my opinion anyway). In the past, I used to post for kayak diving buddies (mostly local or dive forums) and even now, I have seen others (Mav), also ask, if anyone is interested. It seems hard to get other divers organised to meet for a dive, I am not sure if they also feel the same as myself about dive buddies with kayaks, if that's why they just don't bother I am not sure. Mind you, Mav dived last week, and I loaned my gear to a diver so we may be able to get him interested, he completed his course 12 months ago, has not dived since but was interested in trying, so we just gave him a quick dive in the shallows so he could get re-acquainted with some gear, will organise a couple of buddy dives for him in the coming future, before starting him off a kayak and will try and help if he is still interested.
As for diving being cheap/not cheap, it depends just how much you wish to pursue it and expand within it, also just who you choose to train with as well. For me, I have no interest in levelling up, and up, and up. I have completed my Open Water / Nitrox and only did the nitrox because it was cheap and to make up numbers so the course would run for others. Have no need for it, and have only used it once since, my course cost $350, my gear counting dive lights etc $1500 (tops). I completed roughly 170 dives in my first year with 75% of those shore based, 2 charter (to rich) and the rest off friends boats where I chipped in for fuel, my fills only cost $5.00 bucks each, and tank hydro's $100 once a year, so diving to me, was a cheap sport. Well, until I had to buy the AI so I could continue, and am now looking at sidemount so I can again (possibly) continue. But again, once I purchase the gear needed, air fills will cost $5.00 bucks and once again I will lift my 100 scallops per week (hopefully). If I do have to give it up and sell most of my dive stuff, I expect I will get roughly 70% back on what it has cost me (not counting AI, mask/wettie/fins/etc, as I would still keep using them).
There are a few others on AKFF, squidder for one I think who also kayak dive, I am not sure how often now though?
What about yourself, do you regularly kayak dive, or just something you are interested in getting into?