Originally Posted by
crossings
The mileage earning limit is seems to be the money that you can invest (i.e. you can earn as much miles as you have money in Euros - in increments of 1000). Also you have to be comdirect customer for this promotion. The "risky" part is that your investments are in fonds based on shares or bonds, so they will fluctuate up (win) or down (loss). I guess I'll pass on this one

In
earlier promotions (click) with buying investment funds it was quite interesting. This time, however, the conditions are not that good, so it is probably only interesting for those who are interesting in such investment anyway (with 80% discount on the issue charges).
For those considering to register with comdirect: I just read in the customer magazine, that starting from 15 April till end of May a referrer receives
50 Euro new-customer-premium (not yet online).