The decision is entirely up to you, I do think your luck will turn around and you will get a streak of jurassics as i did when i was in your shoes and make out for the better. But getting to pick what you want from the 20k packs is always enticing, however you might be waiting months for something of interest to come around at the same time.
From the forums it seems like you are pretty into the game and play a good bit and show not signs of slowing down, it might be worth it for you to consider going VIP. You will get lots of perks especially the ability to do 11k LP trades for VIP’s that you want when they pop up on top of all the other perks.
My jurassic to non jurassic in the 10k packs has balanced out fairly well, there are still a few jurassics i don’t have and i have multiples of a few. Recently i have received 3 turtles out of maybe the last 5 packs… not thrilled but i will keep getting the 10k packs. All the ceno and aquatic vip’s have been super great for doing a little bit of pvp and the PvE so they are growing on me. My daughters game got her 3rd Presto, and after that her forth tylosaurus lol and last night her second Hyanodon but even still hers is pretty balanced out as well.