[Darren] No, they were purely for my own fun, since few games written for the old Atari 400/800 were any good ("Star Raiders" and "Mercenary" aside). I aimed for crude graphics, crude sound but very playable and increasing difficulty the longer you played.
There you have hit the nail on the head, as regards why I still play retro games. They tended to be a lot more playable. You had less in the way of graphics (generally speaking) and sound (also generally), but that made the programmers try all the harder to make games that were fun. I find many modern games extremely tiresome. I had my first computer in 1983 (an Acorn Electron), and that's the one where I first learnt to program. As time went on I moved through the C64, Amiga and now PC (not counting consoles). These days I have got myself a nice little retro collection, having added various other machines to the set (ranging from Atari 2600 to Spectrum to... well, Dreamcast!). I'm sure a part of it is simply nostalgia for childhood, but when it comes down to it, I really do find a lot of older games more entertaining than newer ones - even if the older games are not ones I grew up playing.
[Darren] Cor, another one! That's you, Kevan, me and this guy (note: lots of swearing. Lots. It's also a games-related website, for those with bonus-annoying work nannies).