Here is the rough cost for me bought my RE Himalayan last year for £4100 on the road £499 for the hard alu cases. Since then I have paid £5.99 for a mobile phone holder and case, £39.99 for handlebar protectors, £7.29 for an iridium plug, £10 for some royal Enfield wheel logo transfers £200 for supply and fit of heated grips and optimate smart USB charger. The only thing extra I'm looking to purchase are £20 mirror risers £80 custom screen and £250 gel seat. I plan to keep the bike long term as its a real war horse and the stuff mentioned is to Improve comfort really, the mirror risers and screen will reduce wind buffeting the grips seat and protectors are a warmth and comfort thing the usb charger practicality and let's me connect the optimate charger too. The iridium plug makes the bike marginally smoother on low revs and less warm up time. I try to justify the cost as I plan to keep the bike for many years, it's affordable and adds to the pleasure so I'll be using it more! I think you have to base it on cost affordability and if you plan to keep your bike. But I guess if I was stinking rich I'd just buy whatever made me happy