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Those points are based on game's Steam marketplace price, to be more precise it's based on U.S.A's steam marketplace price (base price, not discounted price).
The highest point is capped at 50 points. It was implemented couple of years ago when there was a flood of cheap software/game bundles.

First question is yes but in $ prices. Also maximum cv amount is 50 for one game so 60$ game = 50 CV. But i guess this is different through packages, i am not sure about that.

Second question i believe they count as 0 CV after deletion since SG basicly get their data through Steam but it could be changed since there is so much removal right now.

The value shown next to your sent and received giveaways is the current full retail value of all the games. If you mouse over the number, you will see a popup with the real CV which is calculated based on when you gave the game away. If you gave it away before the date it was considered bundled, you will always get CV based on the current full retail price. If you gave it away after the date the game is considered bundled (or highly discounted, I think 90 or 95%, but not positive anymore), you will get 15% of the current retail price. If you gave it away after a mass giveaway of the game, you will receive no CV.

All values are always based on the current full retail price in US dollars. Sales do not affect your CV, but a permanent price drop does lower your CV accordingly. It doesn't matter when you gave the game away, CV is always calculated based on the current US full retail value. If you give away high priced games now and their price drops in the future, you will lose CV.

Games that are removed will be calculated based on the last know price. I believe this was done manually by support in the past, but I'm pretty sure it is automatic now. This is from the Change Log.

July 3, 2017 - Updates to how we sync game prices with Steam, which should result in games keeping their value when they're removed from the Steam store, instead of changing to zero value.

Giveaways are capped at a max of 50 points to enter, but CV is still calculated on the full retail price. A $60 game will only cost 50 points to enter, but you will still receive CV calculated off of the $60 price. From the FAQ section "What is contributor value?"

You might also notice that games valued over $50.00 will only require 50 points to enter. However, their full price will be used when calculating contributor values.