SIT's solo perception of a perk is whatever ‘indulgence’ they wish to pay for. e.g. a more expensive hostel’s single room to avoid a boorish, inconsiderate ‘snorer’, classy. restaurant dinner ,    
or 1^st class long distance bus seat. 

       Bus Tours & Cruises intentionally offer an array of expensive services & perks priced based on your EXclusive vs INclusive status. e.g., single supplement lodging, optional shore excursions or tours. Obviously, high end bus tours & cruises may provide best perks.