For what it's worth, here goes: My accountant had bought one the year before (2017) and his take on it was: I get to keep my money in my bank account and BMW don't have a bike.
I bought mine a year later and I put a high deposit in to keep the payments down. BMW GS1200 TE chocolate/grey
I looked after it even though it wasn't mine because A) I look after things, B) it's valued better at the end, and C) it's an annual ritual over the winter in a warm spacious garage to take it apart, clean it up and make sure nothing has come loose over its busiest season in the summer, which I happen to enjoy doing.
I paid the balloon payment and kept it after three years for a further 5 (another story). In all it cost me about €2,300 more than if I'd paid it outright. The total came to about €23,000. I sold it this year for €14,000 with 48,000 kms on the clock ,in a jiffy, and it was immaculate. When I bought it I almost stayed with Triumph (1200) which, although I liked my Tiger 800, I would have lost that difference in the first two years alone!
This year I have done the same with my GSA and because of the high deposit (because I know I'll probably keep it and they hold their value - always will do) I pay about the same every month as I did for my 1200 and I still have 12K in my bank account. Yes, it will cost me (about) the same in interest, so in the end it will be €29,000, but this one came with 3 years FC insurance, with a guaranteed full refund in the first two years, and four annual services (10,000kms) which I don't really do.
Now, I realise that €£2,500 is a lot of money to some, but if that's the case you're in the wrong market for a bike.
You could buy it outright, but why drain your account?
You could own it outright, but if it's going to go wrong it will do so in those first three years. Better to just be able to give it back. You will still have the option to own it
You could wait until you have all the money, but, as many of us of a certain age know only too well, life is full of surprises, and as long as you have a realistic possibility of comfortably keeping up with the payments, then, like so many people who deny themselves pleasures for years because they save, and save, and save, and save, and save, and bloody save for retirement....... well.......
And finally, of course, if you don't spend it now this, and every government to come will find ways to steal it from you anyway.
Buy it any way you want, but don't deny yourself the dwindling options to enjoy your wealth.