"so that we can agree that the exact motives of soldiers, with exact percentages, are no longer the topic of this thread."
Sorry Grishka
Diverted by our resident moron - if this discussion is going to regain a semblance of common sense I suggest he is ignored until he puts up some sort of a justification for his jingoistic rantings - my intention anyway.
Your statement is of course right and is included in the Wikipidia article that was put up right at the beginning of the thread
Of course a considerable number were influenced by the carefully orchestrated propaganda at the beginning of the war - as you say, that happens in all wars.
But all of the other listed reasons were factors in joining - unemployment, glamour, relief of boredom, belief that the war would be a short one, employers forcing employers to enlist having been promised that the rest of the work force would not be pressurised into joining.

Wiki
"The reasons for their enlistment cannot be pinned down to a single factor; enthusiasm and a war spirit certainly drove some, while for others unemployment prompted enlistment. Some employers forced men to join up, while occasionally Poor Law Guardians would also refuse to pay support for fit military-aged men. The timing of the recruiting boom in the wake of the news from Mons, though, suggests that men joined knowing that the war was dangerous and indeed many joined precisely because it seemed to be a threat to their home, district and country.[2]"
At the beginning comradeship and the manipulation of friendship at home was a factor in enlistment - see The Pals Batallions.

Wiki again
"One early peculiarity was the formation of "Pals battalions": groups of men from the same factory, football team, bank or similar, joining and fighting together. The idea was first suggested at a public meeting by Lord Derby. Within three days, he oversaw enough volunteers sufficient for three battalions. Lord Kitchener gave official approval for the measure almost instantly and the response was impressive. Manchester raised fifteen specific 'Pals' battalions; one of the smallest was Accrington, in Lancashire, which raised one. The drawback of 'Pals' battalions was that a whole town could lose its military-aged menfolk in a single day."

As time went on the ladies with their white feathers put pressure on those who had listed to join - even the Suffragettes agreed to cease their activities on the promise of female suffrage when the war was over.
Music Hall stars such as Harry Lauder were persuaded to write and sing songs encouraging youngsters to join "To make man of you".
Somewhere among the tsunami of links which have been given there is a chronological list of how the poster campaign was
Reports from the front (see Patrick Magill) indicated that the patriotic fervour dissipated among many of the volunteers when faced with the brutalities of army life and the stark reality of trench warfare - Tommy Kenny was particularly vehement about this.
By January 1916, 18 months after the launch of the recruiting campaign, British authorities was forced to admit that it had totally failed and they introduced compulsory conscription.
Incidentally, the BBC has just announced that is planning a series of fifteen minute programmes on the history of WW1 which are intended to stretch over several years and cover all aspects of the conflict, both abroad and at home
Jim Carroll