I bought my road bike in 2011 on the cycle to work scheme. It was £850 but probably cost me more like £600. I didnt use it on a regular basis, having had two kids since made me lazy to be honest, but I cycled to work about 75% of the time throughout 2018, with it being close to 100% since May.
At the end of 2017 I was knocked off the bike, so spent £150ish on new, much brighter lights. The rear derailleur was damaged but I had already been planning to upgrade the groupset, so I rebuilt the bike with the full 105 group. It had also had new wheels in 2017 for around £150.
Clothing wise I bought it gradually as I went along, upgrading as things wear out. Last year I bought quite a lot... new rucksack, winter tights, winter boots, thermal jersey... but now I can cycle all year round with no issues. I've just ordered a nice Gore jacket to replace the bright yellow bin-bag I usually wear!
However it saves me a lot on fuel... I cant tell you the current price of diesel, and I last bought fuel at the very start of December, and only £30 then. Also, I was paid out more in compensation for the crash in 2017 than I've ever spent on cycling, so I'm definitely up.... I wouldnt recommend that as a course of action though!