More games = more chances to win booster packs?

I believe its random :D You just have to have at least 1 game that's eligible for boosterpack ( and afked/played so all gamecards in it dropped to the max limit ) and play that week 1-2 hours minimum not sure,to be eligible for a random boosterpack (every time someone crafts a badge so i guess during summer sale we can get boosterpacks heh they been so rare :P )

You can get a booster pack for a game you own only in case you've already gotten all the cards in it you were eligible for.

You can get cards and booster packs only for the games that support this card system.

Number of the games you own doesn't stack and doesn't influence directly your chance to get a booster pack. But of course, having one game with cards will give you lesser chances to obtain a booster pack VS having 50 games with cards.

The only way to increase chances of getting booster packs - is to level up (each 10 levels give you higher chances to get booster packs and foils).

The most important thing is.. The more games with cards you have the more variety of booster packs you might get.. However, a lot of games have 10-14 and maybe more cards which means a booster pack will be roughly $0.2. Best booster packs are for games with small amount of cards.