I have seen 3 different insides in these PS2`s . They started making
the power supply smaller & cheaper . Some of the plastic levers that
have to do with the drawer were changed along with the lazer assembly so
we cant change parts around so easy .

Other changes include the mainboard layout.

Its all planned to only last just a short time so you have to spend more
money .

I don't think so.

In the console business, profit is not made from console sales. Profit is made
from software sales. The design changes in the hardware reduce the price of
the hardware, but it's still going to be sold at a loss.

With the current business, money is lost from hardware sales, but the hope is
that the buyer will purchase software. This is where the profit comes from.
When you buy a PS-2 game, regardless to where it came from, Sony makes money.
In the case that it's made by a third party, a portion of the third party's
profit goes towards paying for Sony's licensing fees, which is where Sony gets
its money. This is a business model that was invented by Nintendo in the early
1980s and currently exists today with some revisions to account for the
inventory differences that exists between mask ROM cartridges and optical
discs. (Mask ROM costs more and takes months to fill an order while discs are
cheap and orders can be filled within a week.) This business model is employed
by Nintendo, Microsoft, and Sony at this time.

As for the PS-2, it's main design drawback is that it is prone to excessive
dust accumulation, especially in conditions that are too dusty or smoky.

The dust is known to collect inside the drive, which causes readability
problems because the dust can interfere with the operation of the optical
pickup and can also hinder the mechanical operation of the disc drive
components, namely the kicker mechanism.

A way to prevent this is to use the console in an area that doesn't have a dust
problem, as well as using it away from the floor. - Reinhart