First of all - is the size. Depending on a size the price of tubes are formed. The most common Nixie tube IN-14 has a middle size and thus is the most affordable and popular. The second criteria, which is also considered is a shape of the digit "5". The most available and common Nixie tube IN-14 has a upside-down "2". Due to some reasons (probably trying to save on production processes) soviet engineers decided to reuse some tools. For visual comparison see the image below.
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