How to value bundled games

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Take a look on the prices other traders want on ST.

I usually check what others are asking on SteamTrades. I also can base prices on lowest price available on usual stores (Steam, Humble etc.) and check at what price people are selling it through Kinguin and G2A. Also take the offer of the buyer into account if it's reasonable

I always check prices on g2a before I trade with person

G2A isn't exactly a solid option when looking at trade options (as I see people pushing that direction). People can ask for whatever price they want on G2A. It doesn't mean Bad Rats is worth 45$ if its listed as such...

Just my 2 cents.

Happy Trading.

Tier 1: 1$/number of games

that's where you should start, then you should increase\decrease the price considering the popularity, the demand, when it was bundled, how many times it was bundled, etc...

1) if an offer is for a game you really want to get rid of, take whatever you can get
2) if an offer includes a game you really want, take it
3) otherwise, look at what other traders are doing
don't look at G2A, those prices can be out of whack
Keep in mind that some traders are crazy, asking much too much. Other traders don't mind waiting years if it means even a 1% increase in price. And traders may not be up-to-date, especially when a new bundle releases and prices haven't been adjusted yet.
Actually, newly bundled games are kinda hard to price - there's usually a glut of supply and a heightened demand at the same time. Some people want to get rid of it fast, some people are willing to overpay, etc. etc. But you can still get a good idea of where the market is.