I did some maths. Acutally, that's a lie, I did some counting, and I discovered that if Word Salad gets over 73 subscribers next year, we will not have enough money to produce magazines for them all.
£300 + (£3 x n) > £2.37 x (3 x n)
where n = number of subscribers
£519 < £519.03 but it's fair close
Since this is an unlikely eventuallity, I am not unduly concerned.