This is the more 'frankensteinian' theme of the Terminator movies - be careful abou creating objects smarter or stronger than you, or you might find yourself wholly expendable.
These mats are made of expendable green resources like non-toxic rubber foam or cork.
Not only will you need to have the expendable finances to treat your skin, you'll also want to commit to your clear skin afterwards by avoiding the sun at all costs.
These little "nickel and dime" purchases are what mysteriously eat away at expendable income, thus they are the easiest to curb.
The bike was a trophy from a time when Dean's budget contained more expendable income.