[Someone1234]

You could just do it in lump sums twice a year or similar. Plus unmanaged funds like indexes have lower recurring fees than managed funds.

[ovi256]

That would reduce the ROI, because doing it often (every day) approximates continuous exponential growth (e ^ x) while doing it in batches reduces to power growth (1 + r) ^ x. See the effect this has in the example given here:

http://math2.org/math/general/interest.htm

[Someone1234]

Until you include fees...