That's common in pnp, you usually don't change your items all the time, and if your are buying them they are usually expensive so you have to save for some time to be able to buy something good. Heavy armor should be rarer too as it is more expensive.
Remember that a common complaint about dos2 was that there was too many items and you would keep changing it every level. I particularly don't find that immersive.
It's not a good idea to shift it the other way either. Of course, in the full game it will be much more than the pnp.
It is difficult to determine how many items the player should get so that he does not get bored and at the same time not to overwhelm him with too many items.
