Use of Abbreviations in Crochet

Question of the week concerns the use of abbreviations in crochet. You can't get around them and they save wear and tear on the finger when keying in the instructions as well as the length of instructions.
The question is about one abbreviation in particular:

Sa = Same

I include a list of abbreviations I use at the end of all my patterns that I sale.
Recently I was asked what stitch it meant when I said: Ch-1, sc sa st as beg ch-1.
Written out: Chain 1, single crochet same stitch as begin chain-1.
I have also been told that the use of sa for same is confusing.

So what is the vote?

Should same be written out completely
or
is sa acceptable?

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