Either give more inventory slots or make buying them cheaper

Right now the inventory slots are too expensive to buy and for an F2P like me who has gotten 10 different item pieces without being to combine them or get enough of them, they take up one-third of my inventory space(30 slots).
To upgrade to 35 slots, a increase of 5 slots, it costs 160 pearls. This price is outrageous for an F2P like me, can't we just decrease the price or give more inventory slots?

 

Just throw the items you dont need away
Im good with 30 inventory places
I dont need more then 3-4 weapons a few shields and fixxer stuff
A little trick fir 3-4 more inventory places is to equip all your ships full
So the stuff isnt in the inventory

 

I kinda agree with Technonew's comment - you need to keep duplicate weapon just to keep em ready to evolve after 10,20 levels etc. that takes extra slots - assuming you use 3-4 weapons and another 3-4 yellow/green/blue items - so 4+4 = 8 slots and probably similar slots for duplicate items.
I too have quite a few slots occupied by inventory items but then i think after 35 there wont be need for more.
One tip - use slot in other boats too - load them with duplicates you're saving for evolving; this can give you some breathing room. All in all this is how the game is for everyone, so have to manage around.
On inventory slots - I kind of rely less on them as when you combine you would get random stuff - so better to save gold (not buying inventory parts from market) rather buy rare/epics weapons of your choice.

 

I'm kind of with you on the inventory slot issue. I ran into that early game but then I realized that I truly didn't need a ton of slots.
Combine your pieces, and use your ships as "a safety deposit box".
I paid for a bunch of spaces but I do wish I hadn't...can't take it back now.
In the end, you'll focus on leveling up specific weapons. Stick with 1-2 ships that you can master and you'll only need a small amount of weapons.