All the time.

I own the classic Nintendo consoles like NES, SNES, and N64, and play them rather frequently.

Been playing Mario Party 2 since 1999.

I prefer older games over new ones, and because I missed out on so many I've always got one running. Since I haven't bought a PS4 yet, I've been playing older games for the most part (Kingdom Hearts, Front Mission 3, Panzer Dragoon Saga, etc), and I'll probably always have one running on the side.

I'm a bit of a mix. For some games i really really like, i will go out and buy the original copy of the game but for collectors purpose.

When it comes to PS classics i will buy either HD remasters or what evers on the PS store. i dont really use emulators so if the game isnt on the ps store but i have it then i'll pop the disc in the system.

For Nintendo, i havent really used the eshop much nor do i really want to so i usually set up the original system if i feel like playing the older games. However since Zelda Oot and MM have been remastered, im more then happy to play those instead.

When it comes to the more obsure games then i guess i'd have to use an emulator.

I obviously know that and I never talked about the xbox. I was disappointed becuz there's no Dreamcast.

Though I did emulate them illegally a few years ago because that was free and easy, I've started to buy them digitally now as I've gotten older. It also helps that a lot of the games can be found dirt cheap on sales sometimes. I just bought Katamari Damacy a few weeks ago for a $1 and that was really fun to experience the first time.

I still buy older games, as far back as Atari 2600, but i rarely play them anymore. They're mostly for my collection.

I buy some older titles (for example the original Crash trilogy), but only digital.

Yeah, infact I'm finally playing through all the original crash right now, and let's just say it's harder than I guessed. I've also just finished playing the second crash. 

I used to buy, collect and play them regularly until a few years back.

Yes. I've purchased both PS2 and Dreamcast titles in the last month. I've played everything from Xbox, GCN, PS2, DC on original discs to NES, SNES, GBA, N64, etc. via virtual console. Just finished "Silent Hill" for PSX on my PS2.

I've previously sold all systems prior to the Dreamcast so anything before that is played either on my Wii U/3DS (VC) or emulated on a Dingoo A320...

EDIT: I'm kidding, of course: I would never pirate games that aren't commercially available anymore ;)