Thats what I was telling them, their argument was this example that they made, that if I had bought 1 BTC for $200 and sold at $1100 then bought back around $800ish, that if Bitcoin went to $4000 per coin, than instead of having a profit margin of $3800 I would have a margin of $3200 on the original coin.
There cannot be discussion when even simple math cannot be agreed on

My thoughts exactly after reading the initial post.

No you aren't missing anything - I'm not sure why they're focused on profit
per coin, instead of profit overall which is the only important metric.

I don't know either, Maybe their worried because im buying higher than my original price that its more likely to drop into a negative profit margin? I'd ask them but now they just say they're talking to a "Rock" And want to have their financial adviser talk to me. <.< Maybe I can have them read this thread or something.
-Edit Does anybody have a article or such that might help? Or maybe, Something that can compare Bitcoins to something they might understand? I know they understand a bit about bitcoins, But I don't think they really understand it that well, Which might be part of the problem.