Comments are meant to be ephemeral and are often deleted on this site. See Why are site comments being deleted?
Comments are for improving/clarifying questions and answers. Answers are the value here on the site. Threads of comments obscure answers and are therefore are on the chopping block.
That's a general answer; after looking I found your comment on gatherer818's answer:
I was going to add an answer very much like this. The problem is that the difference between magic item trade in 44 and 5e appears vast. But there are happier mediums. Simply put: sure you can buy and sell magic items for gold, but the sums involved are going to be astronomical. Yet adventuring can yield astronomical sums eventually. So if your PC wants to buy something, they can, but they're going to have to save the proceeds of several adventures (at least) to afford it.
That's a fine comment but not going to be kept forever. It's a combination of +1, plus an opinion on a magic item economy which isn't really the point of the question. Gatherer could have incorporated your point into his answer but didn't; therefore it got deleted during cleanup after a couple days. I don't intend to undelete it; you could contribute an answer to the question if you want a permanent thought contributed (though do note that the question is asking about something a little different).
For further context, this question has had something like 50 comments on it, half of which have been deleted. I just deleted another 10 while in there. When questions get people into chatty forum mode, we have to crank the comment weedeater up to a higher pitch than we would on an arbitrary question, so that the question and answers get adequate "screen time" and it's not a big reddit-like mess of people hobnobbing with each other.