1 btc for a block explorer? no chance more like 0.10 btc
what expenses? compiling a coin does not cost a lot. ? what expenses have you incurred
also if you can create a coin you can compile the block explorer using iquidus and a 5$ vps !!
just the website under development cost a good money sir. 1 btc is a very little amount once you start adding 3 party ads