The rhetoric of Open Government Data (OGD) concerningits benefits seems to lack anchor in practice affecting practitioners andempirical evidence restraining academia. This rhetoric could be hard tosee for those already persuaded. As such, the rhetoric could contain in-consistencies that are based more on myths than facts, contributing tothe slow pace of OGD development. OGD is sometimes based on dog-matic rhetoric that is overly simplistic, which hides significant benefitsand blocks potential audiences from seeing the practical applications ofOGD. The purpose of the present study was to analyse the persuasive-ness of present OGD arguments from a rhetorical perspective to identifyrhetorical patterns. We conducted desktop research, investigating therhetoric of eight websites emphasising OGD benefits. Our findings in-clude four common patterns of the rhetoric involving persuasion anddissuasion. The rhetoric contains paradoxes of promises and discover-ies, which we categorised as the grand quest, promised opportunities,tribal solidarity, and the silver bullet patterns. A further finding was twomythical paradoxes: (1) promises versus discovery and (2) proving whilearguing.