As far as eggcorns go, I admit that this is a stretch. In fact, it probably isn’t one at all. It’s probably better analyzed as some sort of idiom blend between formal aspects of “take X for granted” and meaningful aspects of “take advantage of X”. I first heard this while listening to parts of the Switchboard corpus, but in that case the speaker corrected himself.
A: It’s interesting, I really hadn’t given any thought at all to things like buttons and seams, but I guess I’ve just begun to take that for advantage that buttons are not going to be sewn on, I mean, took that for granted that buttons are not going to be sewn on very well.
A google search reveals a small number of attestations (below). These all seem to be paraphrasable with “take X for granted,” but with the restriction that what you are taking for granted is something positive, and something which “gives you an advantage” or which could potentially be (improperly) taken advantage of. Compare this with the possibility, probably only available in formal writing, of “take X for granted” meaning “assume” (e.g., From here on I will take it for granted that {Bi: i in I} is a partition, and rely on this in statement and proof of results.)
The big issue is that “granted” and “advantage” really don’t sound alike, except for the rhyme of the stressed syllable and following bit of the next syllable ([ant@]).
Put the energy to good use, but don’t take it for advantage and push the horse too hard too fast. (link)
Brandy: It’s pretty good. Some schools should have it because people talk a lot about people. I’m not sure exactly why but maybe if someone got to understand what someone else was going through every now and then, they wouldn’t take it for advantage but they would try to understand a person and actually reach out to them instead of hurt them. (link)
Always willing to lend a helping hand but dislike those who take it for advantage (link)
this movie is so awesome it makes me think how good we all have it and take it for advantage i like it even though it ends differently than the book its still way cool and all philosophical like ([link(http://www.gnovies.com/discussion/fight+club.html))
What a wonderful gift God has given to us and we take it for advantage everyday (link)
Treasure your friends and do not take them for advantage. (link)
