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According to source the ecc has to 'kick-in' about 3700 times per year and dimm module. That's 10 times per day and dimm.
Depending on how important your server is to you you'll either need it (in case of important data you absolutely don't want to lose) or forget about it (just a hobby project, nothing serious).
For large storage, ECC helps a lot for avoiding storage corruption. In combination with a redundant architecture in zfs it is almost bullet-proof. (Make no mistake, redundant storage is no substitute for backups! You still need those.)
One option is to use comparatively old server hardware. I have some pretty old stuff (around 10 years) that uses DDR3 RAM, which is dirt cheap, even with ECC (somewhere around 1 €/GB). And it will be fast enough by far for most applications. The downside is higher power consumption for the same performance. The Dell T320 I have with eight 3.5" SAS disks and 32 GB RAM uses some 140 W of power, to give you a ballpark figure.