Well, as we all know, it's 100 'GF Points' (Worth about $2.40USD) for a pack of 5 girlfriends and each gf has a 95% chance of being common, unplayable trash. The other 5% are sorted into 5 rareness categories: big tits, minority, goth, amazing-fat, and ultra-golden goddess (UGG being the rarest at a 1/2100 chance of being pulled). Now here's the part that's super money-hungry degenerate of the devs: you need FIVE copies of the SAME Ultra-Golden Goddess to merge into a RANDOM holographic gf of ANY RARITY. There are SEVENTEEN UGG tier girlfriends, so to guarantee that you get 5 of the same one, you would need to open 69 UGGs. Since approximately 1 in 2100 cards will be an UGG, you would expect to see one every 420 packs you open.
And what's 420 times 69? TWENTY-EIGHT THOUSAND NINE HUNDRED AND EIGHTY PACKS. Each of those packs are worth $2.39544513457557 real world dollars. This means, that for you to get a holographic girlfriend in this pay2win trash game, it could cost you up to: