Well, biggedon, there was a time lapse between when I asked my question and got any response. I put in a lot of thought during that time.
I don't know why you sound so cross, though. As you say, it's up to me. For most domaining (and life) issues there are folks on both sides of the question. But, logically speaking, even if everyone were on the side opposite me, that wouldn't necessarily make my position wrong, or even untenable. Many of the now accepted parts of modern life were once frowned on.
If I owned xxxxx.com, I would be naturally be delighted. But if I am only able to buy xxxxxz.com, I am not going to turn my nose up at it. That's just me, of course. Others might go into a lifetime sulk and make do with nothing instead. We are all different and I'm sure this is as true of domainers as of any other group of people. Nor need domainers who do actually own xxxxx.com think that a proliferation of xxxxxz.coms will in any way diminish the value of their ownership. After all, just because I'm happy to wear zircons doesn't mean that this reduces the value of real diamonds. In fact, it seems to me that it enhances it.
So, yes, I am definitely having a go at this niche. There is really very little help from veteran domainers as to what to look for on a limited budget, i.e., from registering. While this is quite understandable - this is a competitive business, after all - it doesn't alter the fact that it is so. We all have to make our own way and, I guess, make our own mistakes.
At the very least when a reasonable time spent domaining has elapsed, even if I have failed miserably, I will be able to write a book charting my adventures in the domaining world, with chapters headed up 'Double-sses and zee numbers,' 'I and e names,' 'How not to do domaining,' etc.