the price of the equipment ,would be the same as far as the drone and the device you use for your screen ,then there are some basic things like a landing mat and or leg extenders and maybe some ND filters ,after that it depends what you intend to do with the images you get, if you want to edit them them you will need a fairly powerful computer with a good video card in it
if you intend to do it commercially then a part 107 license will be needed ,and a $5 registration fee to the FAA, could be anywhere from around $2000 upwards depending on what you get new or used
if your question was more related to your personal investment ,in terms of time and effort ,then the more time you give to the hobby, then the better you will become at it ,maybe i miss read your post, i thought you meant cost as in money