Is all this REALLY necessary?

I don't think so. Those specs are for a bike being raced. Valve clearances, oil, clean filters and ride.

45 hours its till new

should run for at least a couple hundred hours plenty of people get huge km out of them

eg for one example see enginenumbers post on the last page

http://husaberg.org/husaberg/17145-what-s-your-journey-got-you-your-husaberg-5.html

I would check the axial play of the crank to make sure the main bearings are properly setup; take the ign cover off and measure how far the crank moves side to side in the bike you want around 0.5 but bit under 0.4 is OK.

watch the cam follower bearings and valve springs near 200 hrs you can put dual springs as a safety measure, there is quite a choice of springs

http://husaberg.org/mechanical/10680-all-about-valve-springs-nice-pics.html

if you check the valve lash regularly say every 30-40hrs it will give you a feel for how the valves and also the cam follower bearings are going

once you start riding it a lot it won't be the engine that annoys you its the forks

Hey there,
the bikes do have a weird bit of engine noise until under rpm, the drive chain makes plenty of noise, I always wear ear plugs , even with the chain correctly adjusted I think it still clatters ,just as the induction noise or whistle under the seat.

A bit like getting into a race car , you properly not going to hear the radio or be able to adjust the air /con much

Maintenance schedule ," well I did have to change the battery on my old 550 , the original only lasted 7 years".
It once sat for 6 months without charging it , still the bike started off the battery. I removed the kick starter altogether , it just gets in the way when I had to put the choke on. ( Would make a great paper weight in the office).

I rarely checked the valve clearances , only changed the oil every 3 rides ,perhaps the same with the paper oil filter at times. If not dusty conditions I used to get 3 rides before cleaning the air filter.

I run cheapo mineral oil ( Delo ) and cooking oil on the air filter and hardly oiled the drive chain , come to think of it , I didn't even wash the bike much , to busy riding it. That should save you money for parts later on.

Keep the swing arm bearings greased , and as above keep an eye on cam follower bearings , its pretty cheap to replace them at the 200hr for piece of mind , then just keep on riding it..

If your on the throttle all the time and racing it up in the rpm, that's when it pays to be more mindful of oil and inspections.

I think with the performance you get out of the engines , the maintenance is not so bad. The race schedule is so you will hopefully never experience a break down or engine failure under race conditions if followed. What they are saying there is once you go past those recommended time frames , you are getting into the unknown probabilities with the engines under race conditions after the 60hrs. While they may last longer , it is a flip of the coin I would say.

They are a pretty robust bike in my experience ,just ride the damn thing and enjoy..