Hi Razzi
No they dont realy grow faster but you can produce a lot more from a small amount. You basicly take a growth bud (epical. auxilery tuber shoot or lilly scale etc)this is trimed back ahd washed thoughrely then placed in a bleach and water soulution then trimed then wash in a alchole solution then placed in a growth Media ( usualy nutrients,aminoacids and hormons suspended in agar) all of this is done in a sterile enviroment (laminer flow hood) tools are steralized at each pointthe growth nutrients are tweecked to couse the growing bud to produce multiple side buds these cultures are then divided again and again under sterile conditions each time in renewed media. I keep my flascked cultures in growth chambers where temprature and light can be regulated after this proces cultures are placed in to media that have difrent composition of hormons amino acids and nutriants to promot root growth once root growth is established depending on what you are culturing a number of divisions can be mad of the plantlets and then they are hardend of in a controled enviroment. a flow sheet can be made of this with control points and critical control points placed in this will help develop protocals to follow. thats it in a nut shell its not rocket sience but it is science all of this can be achived with out the fancy equipment with things avalable in the kitchine and then as you progress add to you equipment IE a laminer flow cabinate can cost $3000.00 and up or you can make one your self using perspex and hep filters and fans
so in ansewring you question it is quicker to get a larger quantity of cuttings from a little amount of material espesialy if it is rare
I do hope this explains it enough in the small amount of room available
Cheers
Les