Should we try to keep up the standards?

I have been into Ripon to the hairdresser's salon today. Have I put the apostrophe in the correct place? Yes, of course I have. But on the way back I noticed the following signs - ICES'
Banana's and Coffee's and Tea's. And I remembered from my days of teaching English in a Comprehensive School that one of the most difficult things to eradicate was a pupil's tendency to put an apostrophe in front of every s they come to. (Using'they' instead of 'he' or 'she' here is another irritation, but that is another story.)

And I do begin to wonder if teachers are banging their heads against a brick wall; if it might not be better to stop using the apostrophe all together. Is it only me who is irritated by its misuse? Really, I would rather there was no apostrophe than one in the wrong place' I will be interested to see what you think.

And while we are on the subject of signs placed on the side of the road - I passed a very funny one this afternoon, coming back from Ripon. There was a sale advertised in a village hall from 2pm to 4pm - and according to the sign it was a sale of( and I quote) "Second Hand Children".
I certainly don't want one of those - don't know how you feel!