It is fun to drive. の意味は？

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It is fun to drive, but if it does not make economic sense, we can do without it. It has not come to that just yet.

google翻訳: 運転するのは楽しいですが、経済的に意味がなければ、なくても構いません。まだそこまで来ていません。

「なくても構いません」とは何ですか？また、come to that は「そのこととなると」と出てきたのですが、そういう意味で使われてるのではないのでしょうか？

未設定 · Answer

This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
GT'd not be good at reading between the lines/metaphor, also I'm too. 
I suppose I would like to know the source of reference, or at least several sentences around this sentence.

It is fun to drive. の意味は？

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