I personally have no problem with that, but the better idea is one that can go along with the game anywhere. The plexiglass solution isn't portable.
People want an idea that can be placed inside the box and taken with them anywhere.
I beg to differ. Us LAZY Americans certainly can schlep that around in our car.
It wouldn't be heavy and the board is not THAT big.
Again, for a better solution, you sometimes have to make sacrifices like cost or portability.
Everybody always wants the lazy-mans way out, and often times, that's not the best way.
Me, I will put the board under glass in my 8 foot gaming table.
Then again, that board has only made one road trip... but it does fit in the back of my Dodge Durango. It is in two pieces.