I have a hypothetical question.
ARKK ETF's TER (total expense ratio) is 0.75%. Suppose it is higher. At what (hypothetical) TER threshold percentage would you think it could be too expensive to invest in this ETF?
Firstly, this is an actively managed ETF, not a passive 1, hence you will expect the expense ratio to be higher.
secondly, don't really too much into expense ratio when you are investing into "different theme" of ETF. if the ETF is of the same theme, e.g. you want to invest into an ETF that focuses on cloud computing, then yes, comparing the expense ratio of the diff ETFs in the same theme makes sense.
In the case of ARK ETFs, are there any other remotely close ETFs of the same theme to be compared? if not TER is no longer a concern.
What you should be concerned is about the returns.
if it can give you returns of 10+, 20+% even with expense ratio of 0.75%, will you choose another ETF with expense ratio of 0.09% but returns is like 2%????
don't give up the whole forest for one tree.