Are you the only VC type investor who has such a strategy?

No, but this is still more of an “excep­tion” rat­her than “the norm”. Some inves­tors who have a simi­lar kind of basic phi­lo­sop­hy (model is more of a “sca­lable Angel” rat­her than “VC”)

https://www.kimaventures.com/ (the only Euro­pean on this list)
http://rightsidecapital.com/ (we owe a lot to the­se guys for set­ting up a role model we have taken full advan­ta­ge of. Big thanks to Kevin & al for the ins­pi­ra­tion and open­ly sha­ring their thin­king)
https://svangel.com/ (buil­ding on the heri­ta­ge of the ori­gi­nal Supe­rAn­gel Ron Conway, they have the lon­gest track record to demon­stra­te the stra­te­gy works)
https://500.co/ (the most vocal on this list. For them inves­ting is just one of the things they do)
The­re cer­tain­ly are more but most inves­tors with this stra­te­gy tend to pre­fer a low public pro­fi­le, they focus on their busi­ness rat­her than PR.