[RajT88]

Think of it this way:

Savvy users who will become wise to the grift somewhere along the way are the ones they want to weed out. Early in the process ideally.

Having totally convincing emails fails to weed out these savvy users - you get to discover who they are a bit further down the line, after you've invested some time.

Since their time they can spend is finite, they want to only spend time on sure bets. This is why it is important to take a few moments to lead on scammers - you're damaging their ROI the more of their time you can take up.

[UIUC_06]

You've just restated exactly what the article says, but yeah.

[justsomehnguy]

Yes, but there is a thing what many comments here misses: those email do work, so not only they filter out not-dumb people, they are running on a successful strategy.

Using a proper spelling would improve the conversion but also would add a lot more work for the scammer and therefore he can miss a real doofus who can be scammed, so the overall KPI (heh) would be lower.

Yes, it still the same, but with an additional key part.