I never angle the flame down into the bowl. This is how I would ruin a rim or char the inside of the bowl. That is too hot!!! for me anyways. Feel free to treat your pipes however you want. But, me, I hold my flame sideways about a half inch above the rim and draw the heat (not the flame) down into the tobacco. This will more evenly ignite the tobacco than if you angle it down. It is the heat you want, not necessarily the flame. This preserves my rims and gives me an excellent tasting ignition, to make the whole bowl taste good from start to finish. This also works on a tall 3" chimney only half packed. The heat travels down, not neccesairly the flame.
I've always wondered why guys complain about the taste of the fluids in their tobaccos, and wondered why people char their rims so much.
You can do what you want, but if you are having an issue getting a Bic to light your pipe, where you would want to buy an angled lighter, give this a shot.
1/2 inch above the rim, draw the heat down, not the flame. And, if you draw too hard (notice the flame doesn't go down) then you will actually see flames from the ignited bowl rise up. Give it a try. It may save your rims, and some money buying a lighter that will possible char your pipes on the inside. Ever see an estate pipe with crackles on the inside... yep, someone didn't ever light their pipes properly.
I got this watching my uncles use a match to light their pipes. They always held the match way above the tobacco. This may be becoming lost knowledge with guys not having other pipe men around them.